In June 2001, the City of Chicago signed an agreement with Commonwealth Edison and the Environmental Resources Trust to purchase 20% of its electricity from clean, renewable resources by the end of 2005. The city reached this goal in 2008, the city with a purchase of 215 million kWh of wind and biomass energy from MidAmerican Energy. The city's plan is to maintain that 20% level for the foreseeable future. As of October 2011, the City was purchasing 20% of their power from renewables.